Bully Whippet – Whippet Double Muscling. Bully whippet syndrome is known as double muscling trait found in Whippet dog breed.
A mutation within whippet breed has been discovered which causes muscle mass doubling in the affected dogs. Double muscling affected dogs appear as heavily muscled dogs, with broad chest, strongly developed leg and neck musculature. Based on their appearance, bully whippets are easily distinguished from unaffected whippets.